Best Driver Shaft for 95 to 105 MPH Swing Speed

If you have a moderate swing speed, roughly 90 to 105 mph, most golfers should start with a Regular flex driver shaft when their tempo is smooth, and move to Stiff when their transition is quick or their speed is closer to 100. On the Steadfast Jupiter One, Regular covers 90–99 mph (241 CPM, 55 grams) and Stiff covers 100–109 mph (258 CPM, 58 grams). So the choice at 95–105 mph usually comes down to where you sit in that range and how you swing.

That's the quick answer. The rest of this guide covers what a moderate swing speed means, why this range is so easy to get wrong, what to look at besides flex, and how to check you've picked the right one before you spend anything.

By Steadfast Golf Team · Updated October 2026

What counts as a moderate swing speed?

There's no official definition, so here's the one we use: about 90 to 105 mph with the driver. That range sits right around the average golfer and a little above it. TrackMan puts the average male golfer at about 94 mph, a 10 handicap at about 95, a 5 handicap at about 101, and a scratch golfer at about 110. Shot Scope's launch monitor data, from golfers who bought one, averages a little higher, at 95.6 mph.

Those figures are for men. Women's averages run lower, with TrackMan showing about 79 mph for a 15 handicap and 87 mph for a 5 handicap, so many women will fit better in our guide to the best driver shaft for slow swing speed. If you don't know your number, a launch monitor session will tell you in minutes, and our guide on how to find your driver swing speed without a launch monitor shows you how to get close without one.

Why 95–105 mph is a tricky range to fit

This range covers a lot of golfers, from strong mid-handicappers to low single-digit players, and it sits right on the line between Regular and Stiff. That's where "one size fits most" shafts stop fitting.

A shaft that's too soft for you can feel whippy and often shows up as a high, spinning ball. A shaft that's too stiff doesn't load properly, and that tends to show up as low, weak shots. The Driver Shaft Flex Chart shows the full range of speeds.

It also helps to know that the line between Regular and Stiff isn't the same everywhere. Steadfast's Regular runs to 99 mph and Stiff starts at 100. Golf.com's chart, built on True Spec data, puts Regular at 84 to 96 mph and Stiff at 97 to 104. Hireko says Stiff suits 90 to 105 mph, and Callaway lists Stiff for 95 to 105. Hireko also points out that there's no industry standard for flex, so a "Stiff" from one maker can play softer or firmer than another's. That's why, if you're comparing brands, you should compare weight and CPM, not just the letter.

One more thing worth saying plainly: 105 mph is a strong swing, but it isn't tour speed. Don't pick a shaft as if you swing like a pro. That's one of the most common mistakes at this speed.

Regular or Stiff? Tempo breaks the tie

Swing speed gives you a starting point, and tempo decides the close calls. Two golfers at 97 mph can need different shafts if one swings smoothly and the other attacks the ball from the top. Hireko puts it this way: a quick, aggressive tempo puts far more load on the shaft than a long, smooth one at the same speed.

These are starting points, not rules. If your number falls within 3 or 4 mph of a boundary, the way you swing matters as much as the number.

What else matters besides flex

Flex gets all the attention, but weight, torque and balance also change how a shaft plays for you.

Shaft weight affects tempo and feel. MyGolfSpy says driver shafts typically run 55 to 65 grams, and Hireko says stock driver shafts sit in the 50 and 60 gram range. The Jupiter One is 55 grams in Regular and 58 grams in Stiff, so both sit at the lighter end of that range. How much weight changes your results varies from golfer to golfer, so use it as a feel preference, not a promise of extra speed.

Torque is how much a shaft twists during the swing. Independent sources treat it mostly as a feel factor. Tom Wishon says torque affects performance "a little bit, but not nearly as much as does the shaft's weight," and MyGolfSpy points out that there's no standard way to measure it, so one brand's number can't be compared with another's. Steadfast builds the Jupiter One with torque and balance as its first priorities, and its product page says the weight balance between head and shaft is meant to make the swing through the ball easier. That's the company's design goal, so treat it as a reason to test the shaft, not as proof.

Where the Jupiter One fits

Here are the Jupiter One specs from the product page, including the two flexes on either side of your range.

CPM is a measure of stiffness, so a higher number means a stiffer shaft. Notice the shaft gets heavier as the flex gets stiffer.

Steadfast ran its own head-to-head test on a single TaylorMade M5 driver head against two unnamed aftermarket shafts, and the Jupiter One came out with higher ball speed and lower spin. That's a data point from the company that makes the shaft, on one head, so use it as a reason to test it yourself. If you try a JUPITER One Driver Shaft and the flex isn't right, our 60-day flex guarantee lets you exchange it for a different flex. It's an exchange, not a refund. For smoother swingers who want a lighter shaft, there's also the Jupiter Lite Driver Shaft.

How to check you've picked the right one

Start by writing down your current shaft, including the model, flex and weight. It's the baseline you're trying to beat. Then use real numbers: launch angle and spin from a launch monitor beat guessing every time. Look at your usual miss too. A consistent miss is useful information, and an inconsistent one often points to a flex or weight mismatch. Don't assume stiffer is better either. Plenty of golfers around 95 mph play best in a shaft that loads a little more.

Last, check it fits your driver. The Jupiter One comes with the adapter and grip already installed, for a long list of major brands, in right or left hand. If you're not sure about your head, our compatibility guide walks through it brand by brand.

Questions, answered

Which driver shaft is best for a moderate swing speed?

For a moderate swing speed, roughly 90 to 105 mph, the best driver shaft is usually a Regular flex if your tempo is smooth and you're under 100 mph, or a Stiff if your transition is quick or you're at 100 mph or more. On the Jupiter One, that means Regular (55 g) or Stiff (58 g). Tempo and a few test shots should make the final call.

What flex shaft should I use with a 95 mph swing speed?

Most golfers start with Regular, especially with a smooth tempo. If you have a quick transition or you're closer to 100 mph, try Stiff.

What driver shaft weight is best for 95 mph?

A typical stock driver shaft runs 55 to 65 grams, and that's a sensible starting range at this speed. The Jupiter One is 55 grams in Regular and 58 grams in Stiff.

Is 100 mph a Regular or Stiff swing speed?

On the Jupiter One, 100 mph is where Stiff starts, and Regular covers 90–99 mph. Other brands draw the line a little differently, so compare weight and CPM, not just the letter.

Does shaft flex really matter at 95 mph?

Yes. At this speed you're right on the Regular and Stiff border, so a mismatch is easy to make, and it shows up as inconsistent contact and dispersion.

What if I swing faster than 105 mph?

Then you're moving toward Stiff and X-Stiff territory, with different weight and stability needs. See our guide to the best driver shaft for high swing speed players.

What if I swing slower than 90 mph?

Read our guide to the best driver shaft for slow swing speed.

The bottom line

At a moderate swing speed of 95–105 mph, you're on the Regular and Stiff border, so your tempo matters as much as your number. Start with Regular if you're smooth or under 100, Stiff if you're quick or over it, and compare weight and CPM, not the flex letter, when you shop across brands. Check your number and your miss first, then choose the shaft.